| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| // Use simple device model for this file even in ramstage |
| #define __SIMPLE_DEVICE__ |
| |
| #include <stdint.h> |
| #include <arch/romstage.h> |
| #include <device/pci_ops.h> |
| #include <device/pci_def.h> |
| #include <console/console.h> |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/smm.h> |
| #include <cbmem.h> |
| #include <program_loading.h> |
| #include <cpu/intel/smm_reloc.h> |
| #include "gm45.h" |
| |
| /* |
| * Decodes used Graphics Mode Select (GMS) to kilobytes. |
| * The options for 1M, 4M, 8M and 16M preallocated igd memory are |
| * undocumented but are verified to work. |
| */ |
| u32 decode_igd_memory_size(const u32 gms) |
| { |
| static const u16 ggc2uma[] = { 0, 1, 4, 8, 16, 32, 48, 64, 128, 256, |
| 96, 160, 224, 352 }; |
| |
| if (gms >= ARRAY_SIZE(ggc2uma)) |
| die("Bad Graphics Mode Select (GMS) setting.\n"); |
| |
| return ggc2uma[gms] << 10; |
| } |
| |
| /** Decodes used Graphics Stolen Memory (GSM) to kilobytes. */ |
| u32 decode_igd_gtt_size(const u32 gsm) |
| { |
| switch (gsm) { |
| case 0: |
| return 0 << 10; |
| case 1: |
| return 1 << 10; |
| case 3: |
| case 9: |
| return 2 << 10; |
| case 10: |
| return 3 << 10; |
| case 11: |
| return 4 << 10; |
| default: |
| die("Bad Graphics Stolen Memory (GSM) setting.\n"); |
| return 0; |
| } |
| } |
| |
| /* Decodes TSEG region size to kilobytes. */ |
| u32 decode_tseg_size(u8 esmramc) |
| { |
| if (!(esmramc & 1)) |
| return 0; |
| switch ((esmramc >> 1) & 3) { |
| case 0: |
| return 1 << 10; |
| case 1: |
| return 2 << 10; |
| case 2: |
| return 8 << 10; |
| case 3: |
| default: |
| die("Bad TSEG setting.\n"); |
| } |
| } |
| |
| static uintptr_t northbridge_get_tseg_base(void) |
| { |
| const pci_devfn_t dev = PCI_DEV(0, 0, 0); |
| |
| u32 tor; |
| |
| /* Top of Lower Usable DRAM */ |
| tor = (pci_read_config16(dev, D0F0_TOLUD) & 0xfff0) << 16; |
| |
| /* Graphics memory comes next */ |
| const u32 ggc = pci_read_config16(dev, D0F0_GGC); |
| const u8 esmramc = pci_read_config8(dev, D0F0_ESMRAMC); |
| if (!(ggc & 2)) { |
| /* Graphics memory */ |
| tor -= decode_igd_memory_size((ggc >> 4) & 0xf) << 10; |
| /* GTT Graphics Stolen Memory Size (GGMS) */ |
| tor -= decode_igd_gtt_size((ggc >> 8) & 0xf) << 10; |
| } |
| /* TSEG size */ |
| tor -= decode_tseg_size(esmramc) << 10; |
| return tor; |
| } |
| |
| static size_t northbridge_get_tseg_size(void) |
| { |
| const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), D0F0_ESMRAMC); |
| return decode_tseg_size(esmramc) << 10; |
| } |
| |
| /* Depending of UMA and TSEG configuration, TSEG might start at any |
| * 1 MiB alignment. As this may cause very greedy MTRR setup, push |
| * CBMEM top downwards to 4 MiB boundary. |
| */ |
| void *cbmem_top_chipset(void) |
| { |
| uintptr_t top_of_ram = ALIGN_DOWN(northbridge_get_tseg_base(), 4*MiB); |
| return (void *) top_of_ram; |
| } |
| |
| void smm_region(uintptr_t *start, size_t *size) |
| { |
| *start = northbridge_get_tseg_base(); |
| *size = northbridge_get_tseg_size(); |
| } |
| |
| void fill_postcar_frame(struct postcar_frame *pcf) |
| { |
| uintptr_t top_of_ram; |
| |
| /* Cache 8 MiB region below the top of RAM and 2 MiB above top of |
| * RAM to cover both cbmem as the TSEG region. |
| */ |
| top_of_ram = (uintptr_t)cbmem_top(); |
| postcar_frame_add_mtrr(pcf, top_of_ram - 8*MiB, 8*MiB, |
| MTRR_TYPE_WRBACK); |
| postcar_frame_add_mtrr(pcf, northbridge_get_tseg_base(), |
| northbridge_get_tseg_size(), MTRR_TYPE_WRBACK); |
| |
| } |